Evacuated air chamber



FIG. 1 is a perspective view of an evacuated air chamber showing the new design;

FIG. 2 is a front elevation view, the rear elevation view, the right side elevation view and the left side elevation view being identical;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken lines in the drawings illustrate portions of the evacuated air chamber that form no part of the claimed design. 

CLAIM The ornamental design for an evacuated air chamber, as shown and described. 